Facebook is no stranger to letting members use real money in web apps, but only for in-app purchases. Its new App Center on the web and in mobile versions will let you buy web apps that have an up-front cost to use rather than shoehorning you into a freemium or subscription model. The portal will even have its own shopping portal, although it’ll mostly be based around — surprise — recommendations coming from your social network profile. The addition should, in theory, lead to premium games and other apps that wouldn’t fit into the Facebook Credit mould. Facebook is taking developer beta sign-ups now, although the apps themselves will have to wait.